And he is praising four committees in Congress for agreeing on what he calls "a difficult and complex challenge."

VOA: standard.2009.08.08

So that you will come away with a sense of what you can do, what you can't do, and what kinds of things you should use to tackle complex problems.

因此你们才能对,你们能做的事儿，不能做的事儿,和用何方法去,解决棘手问题有一个基本概念。

麻省理工公开课 - 计算机科学及编程导论课程节选

Botox is an injection of a molecule, or a complex molecule but a molecule, so in what ways would that be Biomedical Engineering?

肉毒杆菌素是一种注射用分子,或者说是一种复杂的分子,但它只是一种分子,它与生物医学工程有怎样的联系呢

耶鲁公开课 - 生物医学工程探索课程节选

No matter what complex emerges, the project should be left in private hands from the start.

FORBES: They Will Rise Again

Tough, as well, to quantify what his complex corporate stakes are worth.

FORBES: Why the man who controls Gucci had to have his own museum.

Microsoft recognised the value of technology in the education system and had engaged "positively and purposefully" in what were complex and difficult negotiations, to get "an excellent deal for schools".

BBC: Microsoft boss Bill Gates has promoted laptops for pupils